Remove Phpunit/Dbunit

- Introduce own Yaml-to-SQL class
- Introduce new way of MySQL-DB-tests (per rollback)
- Remove dependency phpunit/dbunit
- Introduce new dev-dependency for YAML-ready (Symfony YAML reader)

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b9ea7162aa7ede630a2090c883e1174b",
+    "content-hash": "ab69901def2561415a0de62fb86df9bf",
     "packages": [
         {
             "name": "asika/simple-console",
@@ -4267,16 +4267,16 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.16",
+            "version": "v3.4.30",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "61973ecda60e9f3561e929e19c07d4878b960fc1"
+                "reference": "051d045c684148060ebfc9affb7e3f5e0899d40b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/61973ecda60e9f3561e929e19c07d4878b960fc1",
-                "reference": "61973ecda60e9f3561e929e19c07d4878b960fc1",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/051d045c684148060ebfc9affb7e3f5e0899d40b",
+                "reference": "051d045c684148060ebfc9affb7e3f5e0899d40b",
                 "shasum": ""
             },
             "require": {
@@ -4322,7 +4322,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2018-09-24T08:15:45+00:00"
+            "time": "2019-07-24T13:01:31+00:00"
         },
         {
             "name": "webmozart/assert",